Why TB Testing Is Important for Seniors

Tuberculosis (TB) is a communicable disease of public health significance and a ground of inadmissibility under U.S. immigration law. TB testing is required for all immigration medical exam applicants regardless of age.

Seniors who immigrated from countries with high TB prevalence — including Mexico, Central America, Southeast Asia, India, China, and sub-Saharan Africa — may have a higher likelihood of latent TB infection (LTBI) due to prior exposure. This does not mean they have active TB, but it does mean the civil surgeon will evaluate the results carefully.

TST vs. IGRA for Seniors

The civil surgeon may use either the tuberculin skin test (TST) or the IGRA blood test (QuantiFERON-TB Gold or T-SPOT). Both tests are acceptable for immigration purposes.

For seniors who received BCG vaccination in childhood (common in many countries), the IGRA blood test is preferred because BCG can cause a false-positive TST result. The IGRA is not affected by BCG vaccination.

Inform the civil surgeon if you received BCG as a child. This information helps the civil surgeon choose the most appropriate test and interpret the results correctly.

What a Positive TB Test Means for Seniors

A positive TB test (TST or IGRA) in a senior applicant most commonly indicates latent TB infection (LTBI) — past exposure to TB bacteria that is not currently active. LTBI is not a communicable disease and is not a ground of inadmissibility.

If the TB test is positive, the civil surgeon will order a chest X-ray to evaluate for active TB disease. If the chest X-ray shows no evidence of active TB, the finding is documented as LTBI (a Class B condition) on Form I-693.

Active TB disease — where the bacteria are actively multiplying and causing symptoms — is a ground of inadmissibility. However, active TB can be treated, and treatment may resolve the inadmissibility.

Seniors With a History of TB Treatment

If you were treated for TB in the past, bring documentation of your treatment to the civil surgeon appointment. Documentation should include the diagnosis, treatment regimen, dates of treatment, and evidence of cure (such as follow-up chest X-rays or sputum cultures).

Treated TB with documented cure is generally not a current ground of inadmissibility. The civil surgeon will evaluate your treatment history and current status.